Electronic paper display panel, preparation method thereof and display device

Abstract

The invention discloses an electronic paper display panel and a preparation method thereof and a display device, and mainly relates to the technical field of display, the electronic paper display panel comprises an array substrate, a light utilization layer, an electrophoretic reflection layer and an opposite substrate, and the light utilization layer and the electrophoretic reflection layer are located between the array substrate and the opposite substrate; the array substrate comprises a first substrate body, an active switch layer, a plurality of pixel electrodes and a plurality of color resistors, the active switch layer, the pixel electrodes and the color resistors are sequentially arranged on the first substrate body, an electrode gap is formed between every two adjacent pixel electrodes, the light utilization layer is located at the electrode gaps, a plurality of pixel unit areas are defined by the light utilization layer, and the color resistors are arranged in the pixel unit areas. The pixel electrodes, the color resistors and the pixel unit areas are in one-to-one correspondence; the light utilization layer is used for reflecting light rays irradiated on the light utilization layer from the opposite substrate side to the direction of the adjacent color resistors, and through the design, the display brightness, the contrast ratio and the color performance of the electronic paper display panel are improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an electronic paper display panel and a preparation method thereof and a display device. Background Art

[0002] With the continuous development of science and technology, the frequency of electronic digital products is increasing, and various new products are constantly being developed. Electronic paper display panels are a new type of display device, mainly used in electronic tags, billboards, electronic readers and other devices. The display effect of this electronic paper display panel is close to that of natural paper, which can reduce visual fatigue when reading.

[0003] For an electronic paper display panel whose array substrate is located on the light-emitting side of the electronic paper display panel, although the movement of electrophoretic particles can be better controlled, the light transmittance in each pixel unit area of ​​the electronic paper display panel will decrease, thereby causing the display brightness of the electronic paper display panel to decrease. Summary of the invention

[0004] The purpose of the present application is to provide an electronic paper display panel and a preparation method thereof and a display device, which improve the display brightness, contrast and color performance of the electronic paper display panel.

[0005] The present application discloses an electronic paper display panel, which includes an array substrate, a light utilization layer, an electrophoretic reflective layer and an opposing substrate, wherein the light utilization layer and the electrophoretic reflective layer are located between the array substrate and the opposing substrate;

[0006] The array substrate comprises a first substrate, an active switch layer, a plurality of pixel electrodes and a plurality of color resists, wherein the active switch layer, the pixel electrodes and the color resists are sequentially arranged on the first substrate, an electrode gap is provided between two adjacent pixel electrodes, the light utilization layer is located at the electrode gap, and the light utilization layer defines a plurality of pixel unit regions, and the pixel electrodes, the color resists and the pixel unit regions correspond to each other one by one;

[0007] The light utilization layer is used to reflect the light irradiated onto the light utilization layer from the opposite substrate side toward the direction of the adjacent color resist.

[0008] Optionally, the light utilization layer includes a partition wall, a receiving groove and white electrophoretic particles, one end of the partition wall abuts against the opposing substrate, the other end abuts against the array substrate and is located between two adjacent color resists, the receiving groove is located at one end of the partition wall away from the opposing substrate, and the white electrophoretic particles are located in the receiving groove;

[0009] The receiving groove includes a first inclined wall and a second inclined wall. The first inclined wall and the second inclined wall are both inclined and face two adjacent color resists respectively.

[0010] Optionally, two adjacent pixel electrode unit regions are defined as a first pixel electrode unit region and a second pixel electrode unit region;

[0011] The light utilization layer also includes a first electrode, a second electrode and black electrophoretic particles, the black electrophoretic particles are located in the receiving groove, the first electrode is located on the first inclined wall, the second electrode is located on the second inclined wall, and the first electrode is located on a side of the second electrode close to the first pixel unit area, the second electrode is located on a side of the first electrode close to the second pixel unit area, the first electrode is connected to the pixel electrode in the first pixel unit area, and the second electrode is connected to the pixel electrode in the second pixel unit area.

[0012] Optionally, a pixel electrode in the first pixel unit region is defined as a first pixel electrode, and a pixel electrode in the second pixel unit region is defined as a second pixel electrode;

[0013] The light utilization layer further comprises a first electrode connection segment and a second electrode connection segment, a first step surface is provided between the first inclined wall and the outer wall of the partition wall, a second step surface is provided between the second inclined wall and the outer wall of the partition wall, the first electrode connection segment is provided on the first step surface, and the second electrode connection segment is provided on the second step surface;

[0014] The first electrode is connected to the first pixel electrode through the first electrode connecting segment, the second electrode is connected to the second pixel electrode through the second electrode connecting segment, the width of the partition wall is greater than the width of the electrode gap, the orthographic projection of the first pixel electrode on the first substrate covers the orthographic projection of the first electrode connecting segment on the first substrate, and the orthographic projection of the second pixel electrode on the first substrate covers the orthographic projection of the second electrode connecting segment on the first substrate.

[0015] Optionally, the electronic paper display panel also includes a light guide plate, which is arranged on the side of the opposing substrate facing away from the first substrate, and a light outlet is provided on the side of the light guide plate in contact with the opposing substrate, and the orthographic projection of the light outlet on the opposing substrate coincides with the orthographic projection of the partition wall on the opposing substrate.

[0016] Optionally, the cross-section of the accommodating groove is in the shape of an inverted triangle.

[0017] Optionally, the cross-section of the accommodating groove is in the shape of an inverted isosceles trapezoid.

[0018] The present application also discloses a method for preparing an electronic paper display panel, the steps of the method for preparing the electronic paper display panel comprising:

[0019] forming an active switching layer on the first substrate;

[0020] forming a pixel electrode on the active switching layer;

[0021] forming a color resist on the pixel electrode to form an array substrate;

[0022] forming a light utilization layer on the counter substrate, and forming an electrophoretic reflection layer on the light utilization layer;

[0023] The counter substrate and the array substrate are arranged in a box, and the light utilization layer and the electrophoresis reflection layer are located between the counter substrate and the array substrate.

[0024] Optionally, the step of forming a light utilization layer on the opposing substrate includes:

[0025] forming a base layer on the counter substrate;

[0026] A receiving groove is formed on the base layer at a position corresponding to the electrode gap, and the receiving groove includes a first inclined wall and a second inclined wall;

[0027] forming a first electrode on a surface of the first inclined wall, and forming a second electrode on a surface of the second inclined wall;

[0028] A microcup groove is formed at a position of the base layer corresponding to the pixel unit area, and black electrophoretic particles and white electrophoretic particles are filled in the microcup groove and the receiving groove.

[0029] The present application also discloses a display device, which includes a driving circuit and an electronic paper display panel, wherein the driving circuit drives the electronic paper display panel to display a picture.

[0030] Compared with the existing electronic paper display panel, the electronic paper display panel of the present application reflects the light irradiated onto the light utilization layer from the opposite substrate side toward the direction of the adjacent color resistance through the light utilization layer, so that the light irradiated onto the light utilization layer from the opposite substrate side will be reflected onto the adjacent color resistance, and then pass through the color resistance to be absorbed or reflected by the electrophoretic particles under the color resistance. Since the light coming from the opposite substrate side is increased, the display brightness of the electronic paper display panel can be improved, and the light reflected by the light utilization layer will pass through the color resistance and then be absorbed or reflected by the electrophoretic particles under the color resistance, thereby improving the contrast and color performance of the electronic paper display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0032] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application;

[0033] Figure 2 is a schematic diagram of an electronic paper display panel according to the first embodiment of the present application;

[0034] Figure 3 is a schematic diagram of a light utilization layer according to the first embodiment of the present application;

[0035] Figure 4 is a schematic diagram of an active switch layer according to the first embodiment of the present application;

[0036] Figure 5 is a schematic diagram of a first electrode and a second electrode according to the first embodiment of the present application;

[0037] Figure 6 is an enlarged schematic diagram of a first electrode and a second electrode of the first embodiment of the present application;

[0038] Figure 7 is a schematic diagram of a separation wall of the first embodiment of the present application;

[0039] Figure 8 is a schematic diagram of a method for preparing an electronic paper display panel according to an embodiment of the present application;

[0040] Fig. 9 is a schematic diagram of a preparation process of an electronic paper display panel according to an embodiment of the present application;

[0041] Fig.10 is a schematic diagram of a preparation process of a light utilization layer 200 according to an embodiment of the present application;

[0042] Fig.11 is a schematic diagram of an electronic paper display panel according to a second embodiment of the present application;

[0043] Fig.12 It is an enlarged schematic diagram of a receiving groove of the second embodiment of the present application.

[0044] Among them, 10, display device; 20, driving circuit; 30, electronic paper display panel; 40, pixel unit area; 41, first pixel unit area; 42, second pixel unit area; 100, array substrate; 110, first substrate; 120, active switch layer; 121, data line; 122, scanning line; 123, common electrode; 130, pixel electrode; 131, first pixel electrode; 132, second pixel electrode; 140, electrode gap; 150, color resistance; 200, light utilization layer; 210, partition wall; 220, receiving groove; 221, the first pixel electrode; An inclined wall; 222, a second inclined wall; 230, a light reflecting structure; 241, white electrophoretic particles; 242, black electrophoretic particles; 251, a first electrode; 252, a second electrode; 253, a first electrode connecting section; 254, a second electrode connecting section; 260, a separation wall; 270, a protrusion; 281, a first step surface; 282, a second step surface; 290, a base layer; 291, a microcup groove; 300, an electrophoretic reflecting layer; 400, an opposing substrate; 410, a second substrate; 420, a common electrode; 500, a light guide plate; 510, a light outlet. DETAILED DESCRIPTION

[0045] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0046] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, features defined as "first" and "second" may explicitly or implicitly include one or more of the features; "plurality" means two or more. The term "including" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may exist or be added.

[0047] In addition, terms indicating orientation or positional relationships, such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside,” are described based on the orientation or relative positional relationships shown in the accompanying drawings and are merely simplified descriptions for the convenience of describing the present application. They do not indicate that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limitations on the present application.

[0048] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0050] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application. Figure 1 As shown, the present application discloses a display device 10 , which includes a driving circuit 20 and an electronic paper display panel 30 , wherein the driving circuit 20 drives the electronic paper display panel 30 to display a picture.

[0051] The present application also discloses an electronic paper display panel 30, which can be used in the display device 10 described above. For the electronic paper display panel 30, the present application provides the following design, which is specifically introduced through several embodiments:

[0052] Embodiment 1:

[0053] Figure 2 is a schematic diagram of an electronic paper display panel according to the first embodiment of the present application. Figure 2 As shown, Figure 2 The direction indicated by the dashed arrow represents the propagation direction of part of the light. The present application discloses an electronic paper display panel 30, which includes an array substrate 100, a light utilization layer 200, an electrophoretic reflection layer 300 and an opposing substrate 400, wherein the light utilization layer 200 and the electrophoretic reflection layer 300 are located between the array substrate 100 and the opposing substrate 400.

[0054] The array substrate 100 includes a first substrate 110, an active switching layer 120, a plurality of pixel electrodes 130 and a plurality of color resists 150. The active switching layer 120, the pixel electrodes 130 and the color resists 150 are sequentially arranged on the first substrate 110. There is an electrode gap 140 between two adjacent pixel electrodes 130. The light utilization layer 200 is located at the electrode gap 140, and the light utilization layer 200 defines a plurality of pixel unit areas 40. The pixel electrodes 130, the color resists 150 and the pixel unit areas 40 correspond one to one.

[0055] The light utilization layer 200 is used to reflect the light irradiated onto the light utilization layer 200 from the opposite substrate 400 side toward the adjacent color resist 150 .

[0056] The light utilization layer 200 defines a plurality of microcup grooves 291 between the array substrate 100 and the counter substrate 400 , and the electrophoretic reflective layer 300 is filled in the microcup grooves 291 .

[0057] Exemplarily, the electrophoretic reflective layer 300 includes electrophoretic particles, and the electrophoretic particles include white electrophoretic particles 241 and black electrophoretic particles 242. Of course, the electrophoretic particles may also include red electrophoretic particles, green electrophoretic particles and blue electrophoretic particles. This application takes the electrophoretic reflective layer 300 including black electrophoretic particles 242 and white electrophoretic particles 241 as an example.

[0058] The opposing substrate 400 includes a second substrate 410 and a common electrode 420. The common electrode 420 is arranged on a side of the second substrate 410 close to the common electrode 420. The common electrode 420 and the pixel electrode 130 form an electric field to drive the black electrophoretic particles 242 and the white electrophoretic particles 241 to move up and down, thereby absorbing and reflecting the light entering from the side of the array substrate 100, thereby displaying the picture.

[0059] The electronic paper display panel 30 described in the present application is an electronic paper display panel 30 of the array substrate 100 side incident type. In simple terms, the color resist 150 is disposed on the array substrate 100 side, and the array substrate 100 is the light emitting surface.

[0060] The white electrophoretic particles 241 are positively charged, and the black electrophoretic particles 242 are negatively charged. The pixel electrode 130 of the present application is closer to the side of the exit surface, so that when displaying, the pixel electrode 130 can directly drive the electrophoretic particles, and as the distance between the pixel electrode 130 and the electrophoretic particles is closer, the interaction force between them will be greater, thereby improving the response speed of the electronic paper display panel 30. Moreover, since electrophoretic particles of the same electrical properties will repel each other, the pixel electrode 130 can also make the electrophoretic particles more aggregated when displaying.

[0061] For example, when the current pixel unit area 40 needs to display a high grayscale, the pixel electrode 130 is negatively charged, and the white electrophoretic particles 241 are attracted to the pixel electrode 130. As the distance between the white electrophoretic particles 241 and the pixel electrode 130 becomes closer, the movement speed of the white electrophoretic particles 241 becomes faster, and the white electrophoretic particles 241 become more aggregated.

[0062] For example, when the current pixel unit area 40 needs to display the bottom grayscale, the pixel electrode 130 is positively charged, and the black electrophoretic particles 242 are attracted to the pixel electrode 130. As the distance between the black electrophoretic particles 242 and the pixel electrode 130 becomes closer, the movement speed of the black electrophoretic particles 242 becomes faster, and the black electrophoretic particles 242 become more concentrated.

[0063] However, the electronic paper display panel 30 that uses the array substrate 100 side as the light-emitting side, especially the electronic paper display panel 30 that is also provided with the color resist 150, has a display problem of low brightness. The main reason is that the external light needs to pass through the array substrate 100 first and illuminate the electrophoretic reflective layer 300. The light reflected by the electrophoretic reflective layer 300 needs to pass through the array substrate 100 again before entering the user's eyes.

[0064] Since each pixel unit area 40 in the array substrate 100 of the electronic paper display panel 30 has a pixel electrode 130, a common electrode 123, an active switch, a data line 121 and a scan line 122, and the movement speed of the electrophoretic particles in the electronic paper display panel 30 is slower than the charging speed of the pixel electrode 130.

[0065] Therefore, a larger storage capacitor is needed to maintain the movement of the electrophoretic particles to ensure that the electrophoretic particles can move to the target position, so the area of ​​the common electrode 123 is larger. Although the common electrode 123 and the pixel electrode 130 are both made of light-transmitting conductive materials, such as ITO materials, the external light needs to pass through the pixel electrode 130 and the common electrode 123 twice, and the color resist 150 is set, resulting in a lower brightness of the entire electronic paper display panel 30.

[0066] Therefore, the present application adds a light utilization layer 200 to the electronic paper display panel 30. Compared with the existing electronic paper display panel, the electronic paper display panel 30 of the present application reflects the light irradiated onto the light utilization layer 200 from the opposing substrate 400 side toward the adjacent color resist 150 through the light utilization layer 200. In this way, the light irradiated onto the light utilization layer 200 from the opposing substrate 400 side will be reflected onto the adjacent color resist 150, and then pass through the color resist 150, and be absorbed or reflected by the electrophoretic particles under the color resist 150. On the one hand, since the light coming in from the opposing substrate 400 side is increased, the display brightness of the electronic paper display panel 30 can be improved. On the other hand, the light reflected by the light utilization layer 200 will pass through the color resist 150, and then be absorbed or reflected by the electrophoretic particles under the color resist 150, thereby improving the contrast and color performance of the electronic paper display panel 30.

[0067] Among them, the second substrate 410 is a transparent glass substrate, and the common electrode 420 can be made entirely of a light-transmitting conductive material, such as an ITO material. Of course, it is also possible that part of it is a light-transmitting conductive material and part of it is an opaque conductive material. For example, the common electrode 420 directly below the light utilization layer 200 uses a light-transmitting conductive material, and other areas use opaque conductive materials, thereby satisfying the requirement that external light can irradiate the light utilization layer 200 from the opposing substrate 400 side. Preferably, the entire layer of the common electrode 420 of the present application is made of a light-transmitting conductive material.

[0068] The light utilization layer 200 includes a partition wall 210, a receiving groove 220 and a light reflecting structure 230. One end of the partition wall 210 abuts against the opposing substrate 400, and the other end abuts against the array substrate 100, and is located between two adjacent color resists 150. The receiving groove 220 is located at one end of the partition wall 210 away from the opposing substrate 400.

[0069] The receiving groove 220 includes a first inclined wall 221 and a second inclined wall 222 . The first inclined wall 221 and the second inclined wall 222 are both inclinedly arranged and respectively face the two adjacent color resists 150 . The surfaces of the first inclined wall 221 and the second inclined wall 222 are both provided with a light reflecting structure 230 .

[0070] The material of the partition wall 210 includes any one of PFA (Polyfluoroalkoxy, soluble polytetrafluoroethylene) or PS (Polystyrene, polystyrene). Since PFA and PS have high transmittance, light can pass through the partition wall 210 with low loss.

[0071] In this way, the light irradiated from the opposing substrate 400 to the light reflecting structure 230 will be reflected by the light reflecting structure 230 to the bottom of the adjacent color resist 150, and then reflected out of the electronic paper display panel 30 by the white electrophoretic particles 241 under the color resist 150, or absorbed by the black electrophoretic particles 242 under the color resist 150.

[0072] Figure 3 is a schematic diagram of a light utilization layer of the first embodiment of the present application, combined with Figure 3 As shown, preferably, the light utilization layer 200 of the present application is not provided with a light reflection structure 230, but is provided with white electrophoretic particles 241. In this way, when preparing the light utilization layer 200, the white electrophoretic particles 241 in the light utilization layer 200 and the white electrophoretic particles 241 in the electrophoretic reflection layer 300 can be filled at the same time, thereby reducing one manufacturing step and improving the manufacturing efficiency.

[0073] Specifically, the light utilization layer 200 includes a partition wall 210, a receiving groove 220 and white electrophoretic particles 241. One end of the partition wall 210 abuts against the opposing substrate 400, and the other end abuts against the array substrate 100, and is located between two adjacent color resists 150. The receiving groove 220 is located at one end of the partition wall 210 away from the opposing substrate 400, and the white electrophoretic particles 241 are located in the receiving groove 220.

[0074] The receiving groove 220 includes a first inclined wall 221 and a second inclined wall 222 . The first inclined wall 221 and the second inclined wall 222 are both inclined and face two adjacent color resists 150 .

[0075] In simple terms, the angle between the first inclined wall 221 on the left and the horizontal plane is less than 90 degrees, and the angle between the second inclined wall 222 on the right and the horizontal plane is less than 90 degrees. In this embodiment, the cross-section of the accommodating groove 220 is in the shape of an inverted triangle.

[0076] Moreover, when the pixel unit area 40 on the side away from the first inclined wall 221 displays black, in other words, displays a low gray scale; when the pixel unit area 40 on the side away from the second inclined wall 222 displays a bright color, in other words, displays a high gray scale, the pixel electrode 130 in the pixel unit area 40 displaying black is positively charged, and the pixel electrode 130 in the pixel unit area 40 displaying a bright color is negatively charged. The pixel electrode 130 in the pixel unit area 40 displaying black will drive the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222, and the pixel electrode 130 in the pixel unit area 40 displaying a bright color will attract the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222. At this time, the white electrophoretic particles 241 are located on the second inclined wall 222.

[0077] In this way, the light irradiated from the opposing substrate 400 to the second inclined wall 222 will be reflected by the white electrophoretic particles 241 in the receiving groove 220 to the color resist 150 in the pixel unit area 40 displaying bright colors, and thus reflected out of the electronic paper display panel 30 by the white electrophoretic particles 241 under the color resist 150 in the pixel unit area 40 displaying bright colors.

[0078] Figure 4 is a schematic diagram of an active switch layer of the first embodiment of the present application, combined with Figure 4As shown, the active switching layer 120 also includes a data line 121 and a scan line 122, and the data line 121 and the scan line 122 are both arranged on the first substrate 110, and the data line 121 and the scan line 122 are criss-crossed to define a pixel unit area 40, and the data line 121 and the scan line 122 are both made of metal materials such as Cu, and the orthographic projection of the light utilization layer 200 on the first substrate 110 covers the orthographic projection of the data line 121 and the scan line 122 on the first substrate 110.

[0079] In this way, the light that could not go out at the data line 121 and the scan line 122 will be reflected by the light utilization layer 200 and go out from the top of the color resist 150, thereby further improving the brightness, contrast and color performance of the electronic paper display panel 30. In addition, the existence of the data line 121 and the scan line 122 can also prevent the light entering from the side of the array substrate 100 from irradiating the electrophoretic particles in the receiving groove 220, resulting in abnormal display quadrants on the screen.

[0080] Figure 5 is a schematic diagram of a first electrode and a second electrode in the first embodiment of the present application, Figure 6 is an enlarged schematic diagram of a first electrode and a second electrode of the first embodiment of the present application, combined with Figure 5 and Figure 6 As shown, two adjacent pixel electrode 130 unit regions are defined as a first pixel electrode 131 unit region and a second pixel electrode 132 unit region.

[0081] The light utilization layer 200 also includes a first electrode 251, a second electrode 252 and a black electrophoretic particle 242, the black electrophoretic particle 242 is located in the receiving groove 220, the first electrode 251 is located on the first inclined wall 221, the second electrode 252 is located on the second inclined wall 222, and the first electrode 251 is located on a side of the second electrode 252 close to the first pixel unit area 41, the second electrode 252 is located on a side of the first electrode 251 close to the second pixel unit area 42, the first electrode 251 is connected to the pixel electrode 130 in the first pixel unit area 41, and the second electrode 252 is connected to the pixel electrode 130 in the second pixel unit area 42.

[0082] The first electrode 251 is used to connect with the pixel electrode 130 in the first pixel unit area 41 to drive the electrophoretic particles in the receiving groove 220 to move; the second electrode 252 is used to connect with the pixel electrode 130 in the second pixel unit area 42 to drive the electrophoretic particles in the receiving groove 220 to move. It can be understood that the first electrode 251 and the second electrode 252 are not connected together.

[0083] Thus, when the first pixel unit region 41 displays a low gray scale and the second pixel unit region 42 displays a high gray scale, the pixel electrode 130 in the first pixel unit region 41 is positively charged and the pixel electrode 130 in the second pixel unit region 42 is negatively charged.

[0084] The pixel electrode 130 in the first pixel unit area 41 will drive the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222 through the first electrode 251 and the second electrode 252, and the pixel electrode 130 in the first pixel unit area 41 will adsorb the black electrophoretic particles 242 in the receiving groove 220 to the first inclined wall 221 through the first electrode 251 and the second electrode 252.

[0085] The pixel electrode 130 in the second pixel unit area 42 will attract the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222 through the first electrode 251 and the second electrode 252, and the pixel electrode 130 in the second pixel unit area 42 will drive the black electrophoretic particles 242 in the receiving groove 220 to the first inclined wall 221 through the first electrode 251 and the second electrode 252. At this time, the white electrophoretic particles 241 are located on the second inclined wall 222, and the black electrophoretic particles 242 are located on the first inclined wall 221.

[0086] In this way, the light irradiated from the opposing substrate 400 onto the second inclined wall 222 will be reflected by the white electrophoretic particles 241 in the receiving groove 220 to the color resist 150 in the second pixel unit area 42 displaying a high grayscale, and then reflected out of the electronic paper display panel 30 by the white electrophoretic particles 241 below.

[0087] The light irradiated from the opposing substrate 400 to the first inclined wall 221 will be directly absorbed by the black electrophoretic particles 242 in the receiving groove 220, thereby further improving the contrast of the electronic paper display panel 30, and there is no need to add a set of independent driving circuits 20 for the electrophoretic particles in the receiving groove 220, thereby saving the driving cost of the electronic paper display panel 30.

[0088] Furthermore, in order to ensure the connection reliability between the first electrode 251 and the first pixel electrode 131 in the first pixel unit region 41, and to ensure the connection reliability between the second electrode 252 and the second pixel electrode 132 in the second pixel unit region 42, the present application further adds a first electrode connecting segment 253 and a second electrode 252 connecting segment, which are specifically as follows:

[0089] The pixel electrode 130 in the first pixel unit area 41 is defined as a first pixel electrode 131 , and the pixel electrode 130 in the second pixel unit area 42 is defined as a second pixel electrode 132 .

[0090] The light utilization layer 200 also includes a first electrode connecting segment 253 and a second electrode 252 connecting segment. There is a first step surface 281 between the first inclined wall 221 and the outer wall of the partition wall 210, and there is a second step surface 282 between the second inclined wall 222 and the outer wall of the partition wall 210. The first electrode connecting segment 253 is arranged on the first step surface 281, and the second electrode connecting segment 254 is arranged on the second step surface 282.

[0091] The first electrode 251 is connected to the first pixel electrode 131 through the first electrode connecting segment 253, the second electrode 252 is connected to the second pixel electrode 132 through the second electrode connecting segment 254, the width of the partition wall 210 is greater than the width of the electrode gap 140, the orthographic projection of the first pixel electrode 131 on the first substrate 110 covers the orthographic projection of the first electrode connecting segment 253 on the first substrate 110, and the orthographic projection of the second pixel electrode 132 on the first substrate 110 covers the orthographic projection of the second electrode connecting segment 254 on the first substrate 110.

[0092] In other words, when setting the accommodating groove 220, the maximum width of the accommodating groove 220 is smaller than the width of the partition wall 210, and the maximum width of the accommodating groove 220 is the width at the opening, so that the first step surface 281 and the second step surface 282 are formed on the left and right sides of the opening of the accommodating groove 220; and the distance between the first pixel electrode 131 and the second pixel electrode 132 is reduced to ensure that when the opposing substrate 400 and the array substrate 100 are aligning, the first electrode connecting section 253 on the first step surface 281 can abut against the first pixel electrode 131, and the second electrode connecting section 254 on the second step surface 282 can abut against the second pixel electrode 132, thereby ensuring the connection reliability between the first electrode 251 and the first pixel electrode 131 in the first pixel unit area 41, and ensuring the connection reliability between the second electrode 252 and the second pixel electrode 132 in the second pixel unit area 42.

[0093] Furthermore, the depth of the receiving groove 220 is the same as the thickness of the color resist 150 to ensure that the light reflected from the first inclined wall 221 or the second inclined wall 222 can pass through the adjacent color resist 150 without directly irradiating the electrophoretic particles in the microcup groove 291 .

[0094] The present application also arranges a light guide plate 500 on the side of the opposing substrate 400 away from the array substrate 100, that is, the electronic paper display panel 30 also includes a light guide plate 500, the light guide plate 500 is arranged on the side of the opposing substrate 400 away from the first substrate 110, and a light outlet 510 is arranged on the side of the light guide plate 500 that is in contact with the opposing substrate 400, and the orthographic projection of the light outlet 510 on the opposing substrate 400 coincides with the orthographic projection of the partition wall 210 on the opposing substrate 400.

[0095] By providing the light guide plate 500 , most of the light irradiated on the light guide plate 500 can be guided into the light utilization layer 200 , thereby further improving the light intensity in the light utilization layer 200 and further improving the brightness of the electronic paper display panel 30 .

[0096] Figure 7 is a schematic diagram of a separation wall of the first embodiment of the present application, such as Figure 7 As shown, a separation wall 260 is provided in the receiving groove 220 , and the separation wall 260 is located between four adjacent pixel unit areas 40 arranged in a matrix, so as to avoid interference between the electrophoretic particles in the two receiving grooves 220 on the left and right and above and below the separation wall 260 .

[0097] Figure 8 is a schematic diagram of a method for preparing an electronic paper display panel according to an embodiment of the present application, Fig. 9 is a schematic diagram of a preparation process of an electronic paper display panel according to an embodiment of the present application, combined with Figure 8 and Fig. 9 The present application also discloses a method for preparing an electronic paper display panel 30. The steps of the method for preparing the electronic paper display panel 30 include:

[0098] S1: forming an active switching layer on a first substrate;

[0099] S2: forming a pixel electrode on the active switching layer;

[0100] S3: forming a color resist on the pixel electrode to form an array substrate;

[0101] S4: forming a light utilization layer on the opposite substrate, and forming an electrophoretic reflection layer on the light utilization layer;

[0102] S5: Aligning the counter substrate and the array substrate, with the light utilization layer and the electrophoretic reflective layer being located between the counter substrate and the array substrate.

[0103] Compared with the existing electronic paper display panel, the electronic paper display panel 30 of the present application reflects the light irradiated onto the light utilization layer 200 from the opposite substrate 400 side toward the adjacent color resist 150 through the light utilization layer 200, so that the light irradiated onto the light utilization layer 200 from the opposite substrate 400 side will be reflected onto the adjacent color resist 150, and then pass through the color resist 150 and be absorbed or reflected by the electrophoretic particles under the color resist 150. On the one hand, the display brightness of the electronic paper display panel 30 can be improved due to the increase in the light coming in from the opposite substrate 400 side. On the other hand, the light reflected by the light utilization layer 200 will pass through the color resist 150 and then be absorbed or reflected by the electrophoretic particles under the color resist 150, thereby improving the contrast and color performance of the electronic paper display panel 30.

[0104] Fig.10 is a schematic diagram of a preparation process of a light utilization layer 200 according to an embodiment of the present application, such as Fig.10 As shown, S4: forming the light utilization layer 200 on the counter substrate 400 and forming the electrophoretic reflective layer 300 on the light utilization layer 200 comprises:

[0105] S41: forming a base layer on the counter substrate;

[0106] S42: forming a receiving groove on the base layer at a position corresponding to the electrode gap, wherein the receiving groove includes a first inclined wall and a second inclined wall;

[0107] S43: forming a first electrode on the surface of the first inclined wall, and forming a second electrode on the surface of the second inclined wall;

[0108] S44: forming a microcup groove at a position of the base layer corresponding to the pixel unit area, and filling the microcup groove and the receiving groove with black electrophoretic particles and white electrophoretic particles to form a light utilization layer and an electrophoretic reflective layer.

[0109] The material of the base layer 290 may include any one of PFA or PS, and PFA and PS have a high transmittance. Then, after the counter substrate 400 and the array substrate 100 are assembled together, the first electrode 251 is connected to the first pixel electrode 131, and the second electrode 252 is connected to the second pixel electrode 132.

[0110] When the first pixel unit region 41 displays a low gray scale and the second pixel unit region 42 displays a high gray scale, the pixel electrode 130 in the first pixel unit region 41 is positively charged, and the pixel electrode 130 in the second pixel unit region 42 is negatively charged.

[0111] The pixel electrode 130 in the first pixel unit area 41 will drive the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222 through the first electrode 251 and the second electrode 252, and the pixel electrode 130 in the first pixel unit area 41 will adsorb the black electrophoretic particles 242 in the receiving groove 220 to the first inclined wall 221 through the first electrode 251 and the second electrode 252.

[0112] The pixel electrode 130 in the second pixel unit area 42 will attract the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222 through the first electrode 251 and the second electrode 252, and the pixel electrode 130 in the second pixel unit area 42 will drive the black electrophoretic particles 242 in the receiving groove 220 to the first inclined wall 221 through the first electrode 251 and the second electrode 252. At this time, the white electrophoretic particles 241 are located on the second inclined wall 222, and the black electrophoretic particles 242 are located on the first inclined wall 221.

[0113] In this way, the light irradiated from the opposing substrate 400 onto the second inclined wall 222 is reflected by the white electrophoretic particles 241 in the receiving groove 220 onto the color resist 150 in the second pixel unit region 42 displaying a high grayscale, and is then reflected by the white electrophoretic particles 241 below to the outside of the electronic paper display panel 30.

[0114] The light irradiated from the opposing substrate 400 to the first inclined wall 221 will be directly absorbed by the black electrophoretic particles 242 in the receiving groove 220, thereby further improving the contrast of the electronic paper display panel 30, and there is no need to add a set of independent driving circuits 20 for the electrophoretic particles in the receiving groove 220, thereby saving the driving cost of the electronic paper display panel 30.

[0115] Embodiment 2:

[0116] Fig.11 is a schematic diagram of an electronic paper display panel according to a second embodiment of the present application, Fig.12 is an enlarged schematic diagram of a receiving groove of the second embodiment of the present application, such as Figure 11-Figure 12 As shown, different from the first embodiment, the cross-section of the receiving groove 220 of this embodiment is in the shape of an inverted isosceles trapezoid.

[0117] Compared with the solution of the first embodiment, this embodiment sets the shape of the cross-section of the accommodating groove 220 to an inverted isosceles trapezoid, which is equivalent to expanding the distance between the first inclined wall 221 and the second inclined wall 222, thereby avoiding the possibility of connection between the end of the first electrode 251 away from the first pixel electrode 131 and the end of the second electrode 252 away from the second pixel electrode 132, thereby avoiding the failure of the two adjacent pixel unit areas 40 and the inability to display normally.

[0118] Furthermore, a protrusion 270 can be set at the bottom of the accommodating groove 220, and the cross-section of the protrusion 270 is in the shape of an upright triangle. By setting the protrusion 270, the first electrode 251 can be placed away from the end of the first pixel electrode 131 and the second electrode 252 can be connected away from the second pixel electrode 132 during preparation, and the white electrophoretic particles 241 and the black electrophoretic particles 242 can be prevented from attracting each other and sticking together.

[0119] It should be noted that the limitations on the various steps involved in this solution, without affecting the implementation of the specific solution, are not deemed to limit the order of the steps. The steps written in front can be executed first, or later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0120] It should be noted that the inventive concept of the present application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effects will be enhanced.

[0121] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. An electronic paper display panel, characterized in that: The electronic paper display panel comprises an array substrate, a light utilization layer, an electrophoretic reflective layer and an opposite substrate, wherein the light utilization layer and the electrophoretic reflective layer are located between the array substrate and the opposite substrate; The array substrate comprises a first substrate, an active switch layer, a plurality of pixel electrodes and a plurality of color resists, wherein the active switch layer, the pixel electrodes and the color resists are sequentially arranged on the first substrate, an electrode gap is provided between two adjacent pixel electrodes, the light utilization layer is located at the electrode gap, and the light utilization layer defines a plurality of pixel unit regions, and the pixel electrodes, the color resists and the pixel unit regions correspond to each other one by one; The light utilization layer is used to reflect the light irradiated onto the light utilization layer from the opposite substrate side toward the direction of the adjacent color resist.

2. The electronic paper display panel according to claim 1, characterized in that: The light utilization layer includes a partition wall, a receiving groove and white electrophoretic particles, one end of the partition wall abuts against the opposing substrate, the other end abuts against the array substrate and is located between two adjacent color resists, the receiving groove is located at one end of the partition wall away from the opposing substrate, and the white electrophoretic particles are located in the receiving groove; The receiving groove includes a first inclined wall and a second inclined wall. The first inclined wall and the second inclined wall are both inclined and face two adjacent color resists respectively.

3. The electronic paper display panel according to claim 2, characterized in that: defining two adjacent pixel electrode unit regions as a first pixel electrode unit region and a second pixel electrode unit region; The light utilization layer also includes a first electrode, a second electrode and black electrophoretic particles, the black electrophoretic particles are located in the receiving groove, the first electrode is located on the first inclined wall, the second electrode is located on the second inclined wall, and the first electrode is located on a side of the second electrode close to the first pixel unit area, the second electrode is located on a side of the first electrode close to the second pixel unit area, the first electrode is connected to the pixel electrode in the first pixel unit area, and the second electrode is connected to the pixel electrode in the second pixel unit area.

4. The electronic paper display panel according to claim 3, characterized in that: defining a pixel electrode in the first pixel unit region as a first pixel electrode, and defining a pixel electrode in the second pixel unit region as a second pixel electrode; The light utilization layer further comprises a first electrode connection segment and a second electrode connection segment, a first step surface is provided between the first inclined wall and the outer wall of the partition wall, a second step surface is provided between the second inclined wall and the outer wall of the partition wall, the first electrode connection segment is provided on the first step surface, and the second electrode connection segment is provided on the second step surface; The first electrode is connected to the first pixel electrode through the first electrode connecting segment, the second electrode is connected to the second pixel electrode through the second electrode connecting segment, the width of the partition wall is greater than the width of the electrode gap, the orthographic projection of the first pixel electrode on the first substrate covers the orthographic projection of the first electrode connecting segment on the first substrate, and the orthographic projection of the second pixel electrode on the first substrate covers the orthographic projection of the second electrode connecting segment on the first substrate.

5. The electronic paper display panel according to claim 2, characterized in that: The electronic paper display panel also includes a light guide plate, which is arranged on a side of the opposing substrate away from the first substrate, and a light outlet is provided on a side of the light guide plate that is in contact with the opposing substrate, and the orthographic projection of the light outlet on the opposing substrate coincides with the orthographic projection of the partition wall on the opposing substrate.

6. The electronic paper display panel according to claim 2, characterized in that: The cross section of the accommodating groove is in the shape of an inverted triangle.

7. The electronic paper display panel according to claim 3, characterized in that: The cross section of the accommodating groove is in the shape of an inverted isosceles trapezoid.

8. A method for preparing an electronic paper display panel, characterized in that: The steps of the method for preparing the electronic paper display panel include: forming an active switching layer on the first substrate; forming a pixel electrode on the active switching layer; forming a color resist on the pixel electrode to form an array substrate; forming a light utilization layer on the counter substrate, and forming an electrophoretic reflection layer on the light utilization layer; The counter substrate and the array substrate are arranged in a box, and the light utilization layer and the electrophoresis reflection layer are located between the counter substrate and the array substrate.

9. The method for preparing an electronic paper display panel according to claim 8, characterized in that: The step of forming a light utilization layer on the opposing substrate comprises: forming a base layer on the counter substrate; A receiving groove is formed on the base layer at a position corresponding to the electrode gap, and the receiving groove includes a first inclined wall and a second inclined wall; forming a first electrode on a surface of the first inclined wall, and forming a second electrode on a surface of the second inclined wall; A microcup groove is formed at a position of the base layer corresponding to the pixel unit area, and black electrophoretic particles and white electrophoretic particles are filled in the microcup groove and the receiving groove.

10. A display device, characterized in that: The display device comprises a driving circuit and the electronic paper display panel as described in claims 1 to 7, and the driving circuit drives the electronic paper display panel to display a picture.

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